Handle isContractDeployed error on contract page (#5165)

## Problem solved

Short description of the bug fixed or feature added

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## PR-Codex overview
This PR focuses on improving error handling when checking if a contract is deployed. It ensures that if the contract check fails, it will not throw an error but instead return `false`.

### Detailed summary
- Modified `isValidContract` assignment to handle errors gracefully by using `.catch(() => false)` instead of letting the promise reject.
- Ensured that the flow continues to call `notFound()` if the contract is not valid.

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Author: MananTank

apps/dashboard/src/app/(dashboard)/(chain)/[chain_id]/[contractAddress]/layout.tsx

@@ -39,7 +39,7 @@ export default async function Layout(props: {
   }
 
   // check if the contract exists
-  const isValidContract = await isContractDeployed(contract);
+  const isValidContract = await isContractDeployed(contract).catch(() => false);
   if (!isValidContract) {
     // TODO - replace 404 with a better page to upsale deploy or other thirdweb products
     notFound();